R-390A Restoration Series — Power Supply Solid-State Replacement for the R-390A 26Z5W Rectifier Tubes Eliminating a critical obsolescence bottleneck in the PP-621/URR power supply — with full attention to B+ voltage compensation, heater string integrity, RFI suppression, and long-term reliability.…
Collins 516F-2 Power Supply Transformer T1 Wire Identification Guide When the insulation fails and the colours disappear — mapping every winding from the inside out. A practical restoration reference for the CCA community The Problem The Collins 516F-2 power supply…
Boatanchor Legends — A Tribute Series Robert “Bob” Sternowski WB0LBI — Silent Key Collins Radio • Softronics Ltd. • NASA • HF Engineering Pioneer Bob Sternowski spent thirty-four years inside Collins Radio and its successor Rockwell Collins, rising to Director…
Avionics Reference — ARINC 410 / 566A Series, Part 3 The Complete Collins 618M Lineage From ARINC 410 Origins (618M-1) to ARINC 566A/429 (618M-5) · The 313N Series Map · Gables Panel Pairings Confirmed CORRECTIONS & ENRICHMENT FROM JAN SP5XZG…
VK6ADA — Boatanchor Technical Library Care and Feeding of Power Grid Tubes in Vintage Collins Radio Equipment A Modern Reference Guide in the Spirit of Eimac’s Classic Application Bulletin Prepared April 2026 · Fact-Checked & Enriched Edition · Mike Peace…
Collins Collectors Association — Technical Bulletin Commentary CCA Technical Bulletin 1 Understanding and Mitigating S-Line Transmitter Spikes BULLETIN REF: CCA-TB-001 · APPLIES TO: 32S-1 · 32S-3 · 32S-3A · KWM-2/2A · COMMENTARY: VK6ADA, April 2026 ⚠ Priority Action Required —…
Collins 51J-4 Known Issues & Fault Diagnosis General-Coverage Receiver: PTO Endpoint Drift, Oil Tub Capacitor Failures, AVC Anomalies & Mechanical Filter Issues Community-documented problems and proven fixes for the Collins 51J-4 lab-grade general-coverage receiver — covering the 70E-15 PTO, F500B…
Collins S-Line Station Grounding & Bonding RF Ground, Audio Ground & Chassis Ground Are Three Different Things Incorrect bonding between the 75S-3, 32S-3, 312B-4, 30L-1, and 516F-2 is behind a significant proportion of hum, buzz, and RFI complaints — this…
Collins 32S-3 & 32S-3A Known Issues Transmitter-Specific: Carrier Balance Drift, ALC Time Constant, PA Neutralisation Loss & More Community-documented problems, factory service bulletins, and proven fixes for the most common S-Line transmitter restoration issues — the transmitter companion to the…
Web-888 SDR Integration Series National HRO-60 + Web-888 SDR Integration First Published SDR Integration Guide for the Iconic National Boatanchor The HRO-60 has no factory IF output and no existing SDR integration documentation — this guide provides the complete procedure…